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55=13+6x
We move all terms to the left:
55-(13+6x)=0
We add all the numbers together, and all the variables
-(6x+13)+55=0
We get rid of parentheses
-6x-13+55=0
We add all the numbers together, and all the variables
-6x+42=0
We move all terms containing x to the left, all other terms to the right
-6x=-42
x=-42/-6
x=+7
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